In this Sunday, Aug. 12, 2018, the Howe Ridge Fire burns at Glacier National Park, Mont. At least nine homes and cabins in a historic district of Glacier National Park have been destroyed in a wildfire that raged through the Montana park's busiest area and prompted the hasty evacuation of hundreds of visitors. Park officials said Tuesday, Aug. 14, 2018, that the lost buildings include the so-called Big House at Kelly's Camp, a resort developed early last century serving auto travelers along Glacier's famous Going-to-the-Sun Road. (Kristy Pancoast via AP) Kristy Pancoast, AP

In this Sunday, Aug. 12, 2018 photo, the Howe Ridge Fire burns at Glacier National Park, Mont. At least nine homes and cabins in a historic district of Glacier National Park have been destroyed in a wildfire that raged through the Montana park's busiest area and prompted the hasty evacuation of hundreds of visitors. Park officials said Tuesday, Aug. 14, 2018, that the lost buildings include the so-called Big House at Kelly's Camp, a resort developed early last century serving auto travelers along Glacier's famous Going-to-the-Sun Road. (Kristy Pancoast via AP) Kristy Pancoast, AP

In this photo taken Sunday, Aug. 12, 2018, a fire burns next to Lake McDonald in Glacier National Park in northwest Montana. The fire, which was started by lightning on Saturday night, has forced the evacuation of the Lake McDonald Lodge and a nearby campground. (Chris Peterson/Hungry Horse News via AP) Chris Peterson, AP

From left, Yaqmur Abay from Turkey and Anne Ruiz from Spain, two summer employees in Glacier National Park, sit on the edge of the Apgar dock with the feet in the water of Lake McDonald on Monday morning, Aug. 13, 2018. The iconic view into the park has been completely obscured and air quality has been significantly affected by multiple wildfires which are currently burning. (AP/Daily Inter Lake, Brenda Ahearn) Brenda Ahearn, AP

Park Ranger Elizabeth Boyden talks with a visitor at the intersection of Apgar Loop and Going-to-the-Sun Road in Glacier National Park on Monday, August 13. Visitors had to be stopped at Apgar and rerouted either to East Glacier, from which visitors can still reach Logan Pass, or toward North Glacier. (Brenda Ahearn/The Daily Inter Lake via AP) Brenda Ahearn, AP

Park Ranger Mercedes O'Grady working at the intersection of Apgar Loop and Going-to-the-Sun Road on Monday, August 13, 2018, in Glacier National Park. Traffic attempting to go into the park had to be stopped at this point and rerouted through East Glacier if they were trying to reach Logan Pass, or told they would have to wait if they had left things behind Sunday night in the evacuations. (Brenda Ahearn/The Daily Inter Lake via AP) Brenda Ahearn, AP

The Howe Ridge Fire in Glacier National Park started in an area that burned in the 2003 Roberts Fire near Stanton Mountain. Several areas of the park are evacuated, including the Lake McDonald Lodge Complex, and roads and trails near the fire are closed. Glacier National Park,

In this photo taken Sunday, Aug. 12, 2018, an air tanker drops water over a wildfire burning in Glacier National Park, Mont. The fire was started by lightning on Saturday night and forced the evacuation of the Lake McDonald Lodge and closed part of the scenic Going-to-the-Sun Road in the park. Chris Peterson/Hungry Horse News via AP

Waterton Lake Trail, the North Boundary Trail, and the Waterton River Backcountry Campground are closed. Additional closures are expected on Friday.

Parks Canada deployed initial attack aerial resources, but were unsuccessful in limiting fire growth. Parks Canada and Glacier National Park staff cleared hikers from the area and evacuated the Waterton River Backcountry Campground.

On Friday, air resources will be used to slow the spread of the fire eastward toward Waterton Lake as conditions allow.